Messages in this thread | | | From | Jens Wiklander <> | Date | Thu, 1 Sep 2022 13:32:10 +0200 | Subject | Re: [PATCH 4/9] firmware: arm_ffa: Add support for querying FF-A features |
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On Thu, Sep 1, 2022 at 11:04 AM Sudeep Holla <sudeep.holla@arm.com> wrote: > > On Thu, Sep 01, 2022 at 09:56:41AM +0200, Jens Wiklander wrote: > > On Tue, Aug 30, 2022 at 12:07 PM Sudeep Holla <sudeep.holla@arm.com> wrote: > > > > > > Add support for FFA_FEATURES to discover properties supported at the > > > FF-A interface. This interface can be used to query: > > > - If an FF-A interface is implemented by the component at the higher EL, > > > - If an implemented FF-A interface also implements any optional features > > > described in its interface definition, and > > > - Any implementation details exported by an implemented FF-A interface > > > as described in its interface definition. > > > > > > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> > > > --- > > > drivers/firmware/arm_ffa/driver.c | 23 +++++++++++++++++++++++ > > > 1 file changed, 23 insertions(+) > > > > > > diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c > > > index 04e7cbb1b9aa..de94073f4109 100644 > > > --- a/drivers/firmware/arm_ffa/driver.c > > > +++ b/drivers/firmware/arm_ffa/driver.c > > > @@ -571,6 +571,29 @@ static int ffa_memory_reclaim(u64 g_handle, u32 flags) > > > return 0; > > > } > > > > > > +static int ffa_features(u32 func_feat_id, u32 input_props, u32 *if_props) > > > +{ > > > + ffa_value_t id; > > > + > > > + if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) { > > > + pr_err("%s: Invalid Parameters: %x, %x", __func__, > > > + func_feat_id, input_props); > > > + return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS); > > > + } > > > + > > > + invoke_ffa_fn((ffa_value_t){ > > > + .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props, > > > + }, &id); > > > + > > > + if (id.a0 == FFA_ERROR) > > > + return ffa_to_linux_errno((int)id.a2); > > > + > > > + if (if_props) > > > + *if_props = id.a2; > > > > w3 (id.a3) also contains a value when querying for > > FFA_MEM_RETRIEVE_REQ. I see that in "[PATCH 5/9] firmware: arm_ffa: > > Use FFA_FEATURES to detect if native versions are supported" you're > > using this function with if_props = NULL. So I guess that at the > > moment we have more than needed, but in case you need to add another > > parameter to this function you'll need to update all the call sites > > too. > > > > Right, I clearly missed to observe that. I am fine either way. Do you > have any preference ? As long as the callers are with this driver, it > shouldn't be much of an issue to change all, but happy to update to > accommodate w3 as well in v2.
Either way is fine, it was more of an observation.
Cheers, Jens
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